Centering-mold.



PATENTED MAY 21, 1907. B. BLAW. (ENTERING MOLD; 'APPLIOATION IILBD NOV. 12. 1906.

INVENTOR State of {'Pennsylvania, have invented cer 't'aln' new'Tanduseful Improvements in Gen-i UNITED PATENT OFFI E,

JAQOB *BE'BLAW QoF rir'rssune,PENNSYLVANIA, Assienon TO BIIAW' eoLI'JAPsIBLE' STEEL OEN-TERING COMPANY, or. PITTSBURG, PENN? sYLvANIA, t consortia-Tron on NEW JERSEY.

f ie 85 3952.

To all whom it may concern;

' terin Molds, of whiclr the following is a speci'catien. I,

"My "vention'relates to collapsible center- 1 o ing' molds for constructing conerete sewers,

pipe, and the like; and (has for its objects; toprdvide a collapsible mold of flexible ma terial which 'may' easily he collapsed and handled; to i provide 'a' mold having a superlorbracing andcollapsing-means; and'to provide ameld in which "the bottomisection canbe pla'c'ed separately, rendering the-plac in'gofthe other sectionsmore convenient, as hereinafter mo're'f ully explained. I These and 2o dbj'ects are a'cc'om'plishe'd'by my inventIpn one embodiment of which is illustrated in'theacc'ompanying drawingum which, The figure 1s a transverse section through 2- 5 M device is rferably cons tructed bf thin sheet m'etal whichcan be easilyhandledranii' furthercan-be "detached from the concrete after it has set by'a gradual or peeling action, Molds of," this. general typehave heretofore 0 been made in twosections' a's disclosed in my Patent Reissue 12,532' and this two section type is well adapted for small or medium sized sewers, but in flar er sized sewers :the

sections become unwiel y and hard to han'.

3 5 dle and-to meet this difliculty'the type of device as illustrated in this application has been devised. In this type the mold memberis divided into three or-more'parts instead of into two parts as in theold form,

0 thus renderin the sections lighter and more easily handle andfurthermore in the particular form shown providing for the preliminary placing of the bqttom section whereby the other side sections maybe more-easily placed than if all the section's-were placed at V the same time.

' Referring to the drawing, 1, 2, and 3, are the. mold sections of thin sheetmetal, 1 "being the bottom sectiomand 2 and 3 being the side sections, 4 and 5 are stiifening angles secured to the edges of the members 2 and 3 respectively, and overlapping the joints between the members'2 and" 1,- and- 3 and11,'

v Specification of Letters Patent. Application filed November 2, 1906. Serial No. $3,006

f CENTER IN GEMOLD.

\ Patented May 21,1901.

I I I v 6 are holding loops secured to the member 1 Biit knov'm -t'hat -I,-JAooB' B. BLAW, a.

' citizen ofthe United" States, residing at Pijttsburg, in the county of Allegheny and.

are adapted to be passed, 7 is 'a'butt" strap riveted to the member 2 and overlapping the joint between such member and the member 3, 8 is a holding loop secured'to'tlie member 3 and passing; through the strap 7 and adaptcf, -10is' a turnbucklefengagmg holes in the angles 9, and 11,12, and 13, are'other turn-v ed to be heldyijby a securing wedge in' the buckles extending transversely offthe" mold member and 15,16,"and1 v y --'In operation, sufiicientconcrete is first the proper extent; The members 2 and 3 can then-Jbeplaced in position on top of the edges ,2;" n 13, aresecuredto the stilfening anglesin the position shown and tightened to the proper Fextent, The concrete is then filled about the eng'agingthe angles 4, 5, 14,.

placed to receive the member 1,;which'inemofithe memberl and secured togetherat the top, ,-after which the'turnbuck-les 11 inembersL and'3 toithe proper thickness and allowedtoset, after which the mold'may be collapsed. This is accomplished by first tightening the turnbuckles 11 and '13 until the lower edges of the members 2 and 3 are pulled inward, thus gradually loosening'such members 2 and 3 from the concrete ,after which the member 12 is tightened completely freeing the'members 2 and 3 from the'concrete,-

which members can be easily removed from the mold. The member 1 is loosened by tightening the turnbuckle 10 thereby drawing in the edges of the member and gradually loosening it' from the engaging concrete, after which loosening the member can be removed and a new section of sewer started.

In cases in which the sewer formed is of very:

large diameter the number of side sections may, if desired, be madejgreater than two 1' 00 thereby reducing the'weight of each section and rendering them more easy to handle. It I that the member 1 can be preliminafgy placed'in position and the edges, thereof 1 will be apparent from the fore 'oing that the construction is advantageous or the reason. v

'IOR

i buckles did not cross each other in the mancrossed brace construction which provides a act as guides for positioning the side members 2 and 3. Furthermore, after the member 1 is fixed in position, it serves as a path or support forthe laborers While placing the side members. It will be seen that it is much easier to place a small section such as the section 1 accurately,-and then position the other sections from it than it is to accurately position simultaneously two large sections as'is the case when two semi-cylindrical members of the old type are used. The manner, of bracing is also advantageous, theturnbuckle 10 constituting an effect ive means 'for simultaneously loosening the edges of the member 1, and the members 13 and 14 by virtue of their substantiallyradial positions giving the most effective bracing and affording a more direct and positive pull on the edges of the members 2 and 3 in collapsing than would be the case if the turnner shown.

' A further very important advantage of this construction arises where it becomes necessary to remove one section through one or more other sections, about which other sections the concrete is in process of setting. In such a case the section to be removed is se arated into three component parts, and w en the trunbuckles 10 are'removed from the sections through which the knockeddown section is to be-moved, room is provided between the member; 1 and the br tli lces us advantage, it will be seen, results from the three-part construction, together with the large amount of space beneath the braces.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following:

1. In combination, a tubular mold member of flexible material comprising an independent paI'ti-tubular bottom member, and a plurality of separable co-operating partitu ular upper members, and means for 001- lapsing'the parti-tubular members;

2. In combination, a tubular. moldmember of flexible material comprising an independent parti-tubular bottom member and a plurality of separable coroperatingipartitu ular upper members, and means for engaging' the edges of the members whereby they may be sprung inwardly.

3. In comblnation, a tubular mold member of flexible material comprising an independent parti-tubular bottom member and a plurality of separable co-operatin' "parti tu ular upper members, and turnbuc rles for bracing and collapsing the members.

4. In combination, a tubular mold mem ber of flexible material comprising an independent parti-tubular bottom member and a pair of separable parti-tubular side members engaging each other'at their top edges and the lower member at their bottom edges, and

means for collapsing the members.

' 5. In combination, a tubular mold member of flexible material comprising an independent parti-tubu'lar bottom member having a turnbuckle engaging the opposite edges, and apair of separable arti tubular side members co-operating wit-1 the lower member and having a pairof crossed turnbuekles for springing in the edges of the upper sections.

In testimony whereof, I hereunto sign my name 1n the presence of thetwo subscribed Witnesses.

. JACOB B. BLAW.

Witnesses:

J. C. BRADLEY, Anciiwon'rn MARTIN. 

